Add tests for notification module

src/test/java/com/openisle/controller/NotificationControllerTest.java

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+package com.openisle.controller;
+
+import com.openisle.model.Notification;
+import com.openisle.model.NotificationType;
+import com.openisle.model.Post;
+import com.openisle.service.NotificationService;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.MediaType;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.test.web.servlet.MockMvc;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;
+import static org.mockito.Mockito.*;
+
+@WebMvcTest(NotificationController.class)
+@AutoConfigureMockMvc(addFilters = false)
+class NotificationControllerTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @MockBean
+    private NotificationService notificationService;
+
+    @Test
+    void listNotifications() throws Exception {
+        Notification n = new Notification();
+        n.setId(1L);
+        n.setType(NotificationType.POST_VIEWED);
+        Post p = new Post();
+        p.setId(2L);
+        n.setPost(p);
+        n.setCreatedAt(LocalDateTime.now());
+        Mockito.when(notificationService.listNotifications("alice", null))
+                .thenReturn(List.of(n));
+
+        mockMvc.perform(get("/api/notifications")
+                        .principal(new UsernamePasswordAuthenticationToken("alice","p")))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$[0].id").value(1))
+                .andExpect(jsonPath("$[0].postId").value(2));
+    }
+
+    @Test
+    void markReadEndpoint() throws Exception {
+        mockMvc.perform(post("/api/notifications/read")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content("{\"ids\":[1,2]}" )
+                        .principal(new UsernamePasswordAuthenticationToken("alice","p")))
+                .andExpect(status().isOk());
+
+        verify(notificationService).markRead("alice", List.of(1L,2L));
+    }
+}

src/test/java/com/openisle/service/NotificationServiceTest.java

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+package com.openisle.service;
+
+import com.openisle.model.Notification;
+import com.openisle.model.User;
+import com.openisle.repository.NotificationRepository;
+import com.openisle.repository.UserRepository;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+import java.util.List;
+import java.util.Optional;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+class NotificationServiceTest {
+
+    @Test
+    void markReadUpdatesOnlyOwnedNotifications() {
+        NotificationRepository nRepo = mock(NotificationRepository.class);
+        UserRepository uRepo = mock(UserRepository.class);
+        NotificationService service = new NotificationService(nRepo, uRepo);
+
+        User user = new User();
+        user.setId(1L);
+        user.setUsername("alice");
+        when(uRepo.findByUsername("alice")).thenReturn(Optional.of(user));
+
+        Notification n1 = new Notification();
+        n1.setId(10L);
+        n1.setUser(user);
+        Notification n2 = new Notification();
+        n2.setId(11L);
+        n2.setUser(user);
+        when(nRepo.findAllById(List.of(10L, 11L))).thenReturn(List.of(n1, n2));
+
+        service.markRead("alice", List.of(10L, 11L));
+
+        assertTrue(n1.isRead());
+        assertTrue(n2.isRead());
+        verify(nRepo).saveAll(List.of(n1, n2));
+    }
+
+    @Test
+    void listNotificationsWithoutFilter() {
+        NotificationRepository nRepo = mock(NotificationRepository.class);
+        UserRepository uRepo = mock(UserRepository.class);
+        NotificationService service = new NotificationService(nRepo, uRepo);
+
+        User user = new User();
+        user.setId(2L);
+        user.setUsername("bob");
+        when(uRepo.findByUsername("bob")).thenReturn(Optional.of(user));
+
+        Notification n = new Notification();
+        when(nRepo.findByUserOrderByCreatedAtDesc(user)).thenReturn(List.of(n));
+
+        List<Notification> list = service.listNotifications("bob", null);
+
+        assertEquals(1, list.size());
+        verify(nRepo).findByUserOrderByCreatedAtDesc(user);
+    }
+}